For the second layer, there are two ways to go. The easiest is to open the background layer, set the color you wish for the second layer and draw the shape you want on the first layer using the rectangle or oval tool. The shape will fill with the color you've chosen. The second layer will look something like this.
I like a little extra interest. Go to the Filter>Texture>Grain on the main toolbar. And you get something that looks like this.
Add a bevel effect, in this case the Inner Ridge again, and you get something like this.I do like that effect. When it's finally done, it looks kind of like a picture frame that's been built from several smaller frames.
Or like this.
This one is kind of pretty, I think.